Application of Passive Residual Heat Removal System under Blackout Accident of Chinese Advanced Nuclear Power Plant

The passive residual heat removal（PRHR） system provides emergency core decay heat removal during the transient accidents such as blackout or loss of forced reactor coolant flow.Referenced to the design of AP1000,Chinese advanced nuclear power plant applied PRHR to mitigate the accident consequence only by the natural circulation.The blackout accident was calculated to identify the capacity of PRHR of Chinese advanced nuclear power plant by using RELAP5/MOD3 code.The analysis results show that PRHR of HLS can build the natural circulation and remove the core residual heat after the blackout accident successfully.